1、Designation: C 1233 03Standard Practice forDetermining Equivalent Boron Contents of NuclearMaterials1This standard is issued under the fixed designation C 1233; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This standard details a recommended practice for thecalculation of the Equivalent Boron Content (EBC) values forelements that a
3、re of potential significance as thermal neutronpoisons. The values are determined from a knowledge of theatomic weight of elements and the thermal neutron absorptioncross section in barns. This practice is illustrated by using theEBC factors of Table 1 which are based on thermal neutron(2200 m/s) ab
4、sorption cross sections. Other EBC factors maybe used depending upon the actual neutron energy character-istics of the applicable reactor system.1.2 The following elements do not require to be included inthe EBC calculations, as their EBC factors are less than orequal to 0.0001.aluminum fluorine rub
5、idiumbarium lead siliconberyllium neon tinbismuth oxygen zirconiumcarbon magnesiumcerium phosphorusTheir contribution to the total poison effect is not consideredsignificant.2. Referenced Documents2.1 ASTM Standards:C 696 Test Methods for Chemical, Mass Spectrometric, andSpectrochemical Analysis of
6、Nuclear-Grade Uranium Di-oxide Powders and Pellets2C 698 Test Methods for Chemical, Mass Spectrometric, andSpectrochemical Analysis of Nuclear-Grade Mixed Oxides(U,Pu)O2)2C 699 Methods for Chemical, Mass Spectrometric, andSpectrochemical Analysis of, and Physical Tests on, Be-ryllium Oxide Powder2C
7、761 Test Methods for Chemical, Mass Spectrometric,Spectrochemical, Nuclear, and Radiochemical Analysis ofUranium Hexafluoride2C 799 Test Methods for Chemical, Mass Spectrometric,Spectrochemical, Nuclear, and Radiochemical Analysis ofNuclear-Grade Uranyl Nitrate Solutions2C 859 Terminology Relating t
8、o Nuclear Materials23. Terminology3.1 Terms shall be defined in accordance with TerminologyC 859.4. Methods For EBC Determination4.1 Agreement shall be reached between the buyer andseller as to which elements shall be analyzed for calculation oftheir EBC. It is recommended that B, Cd, Dy, Eu, Sm, an
9、d Gdbe included in this calculation. Analytical methods for suchelements shall be those given in Methods C 696, C 699, andC 799, and Test Methods C 698 and C 761 as applicable or asotherwise agreed upon between buyer and seller.4.2 The individual EBC values are calculated using the EBCfactors from T
10、able 1 as follows:EBC of impurity 5 EBC factor!g of impurity/g base material!where:EBC factor = atomic mass boron!sa impurity!atomic mass impurity!sa boron! , andsa = atomic neutron absorption cross section inbarns.The values given in Table 1 have been calculated using avalue of 764 Barns for the ne
11、utron absorption cross section(sa) of boron. This value may vary in nature according to theisotopic composition of the elements. If an alternative value ischosen the EBC factors must be recalculated using the chosenvalue.4.3 If the concentration of any of the elements used in thecalculation is repor
12、ted as “less than” values, these values shallbe used in calculating the EBC.4.4 A total EBC value, if required, is determined by thesummation of individual EBC values.1This practice is under the jurisdiction of ASTM Committee C26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee
13、C26.02 on Fuel andFertile Material Specifications.Current edition approved July 10, 2003. Published August 2003. Originallyapproved in 1993. Last previous approved in 1998 as C123398.2Annual Book of ASTM Standards, Vol 12.01.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Con
14、shohocken, PA 19428-2959, United States.TABLE 1 Equivalent Boron Content FactorsElement Neutron Absorption Cross SectionA(Barns) at 2200 m/s Atomic MassBEBC FactorAntimony 5.1C121.75 0.0006Argon 0.68 39.95 0.0002Arsenic 4.5 74.92 0.0008Boron 764D10.81 1.0000Bromine 6.9 79.91 0.0012Cadmium 2520 112.4
15、1 0.3172Calcium 0.43 40.08 0.0002Cesium 29 132.91 0.0031Chlorine 33.5 35.45 0.0132Chromium 3.07 52.00 0.0008Cobalt 37.2 58.93 0.0089Copper 3.78 63.54 0.0008Dysprosium 940 162.50 0.0818Erbium 159.2 167.26 0.0135Europium 4565 151.97 0.4250Gadolinium 48890 157.25 4.3991Gallium 2.9 69.72 0.0006Germanium
16、 2.3C72.59 0.0004Gold 98.65 196.97 0.0071Hafnium 104.1 178.49 0.0083Holmium 64.7 164.93 0.0056Hydrogen 0.33 1.01 0.0046Indium 193.8C114.82 0.0239Iodine 6.2 126.90 0.0007Iridium 425.30 192.22 0.0313Iron 2.56C55.85 0.0006Krypton 25.00 83.80 0.0042Lanthanum 8.97C138.91 0.0009Lithium 70.6E6.94 0.1439Lut
17、etium 76.4 174.97 0.0062Manganese 13.3 54.94 0.0034Mercury 372.3 200.59 0.0263Molybdenum 2.55C95.94 0.0004Neodymium 50.5C144.24 0.0050Nickel 4.49C58.69 0.0011Niobium 1.15 92.91 0.0002Nitrogen 1.90 14.01 0.0019Osmium 16.00 190.20 0.0012Palladium 6.90 106.42 0.0009Platinum 10.30 195.08 0.0007Potassium
18、 2.1C39.10 0.0008Praseodymium 11.5 140.91 0.0012Rhenium 89.70 186.21 0.0068Rhodium 145.20 102.91 0.0200Ruthenium 2.56C101.07 0.0004Samarium 5670 150.36 0.5336Scandium 27.20 44.96 0.0086Selenium 11.70 78.96 0.0021Silver 63.3 107.87 0.0083Sodium 0.53 22.99 0.0003Strontium 1.28C87.62 0.0002Sulphur 0.52
19、 32.06 0.0002Tantalum 20.6 180.95 0.0016Tellurium 4.70 127.60 0.0005Terbium 23.4 158.92 0.0021Thallium 3.43 204.37 0.0002Thorium 7.37 232.04 0.0004Thulium 105 168.93 0.0088Titanium 6.1 47.88 0.0018Tungsten 18.4 183.85 0.0014Vanadium 5.08 50.94 0.0014Xenon 23.90 131.29 0.0026Ytterbium 35.5 173.04 0.0
20、029Yttrium 1.28 88.91 0.0002Zinc 1.11 65.39 0.0002ANeutron Cross Sections, Vol 1, Parts A and B, Academic Press, New York, 1981 and 1984, respectively.BHolden, N. E., and Martin, R. L., Pure and Applied Chemistry, Vol 56, p. 653, 1984.CIn the absence of other data, the neutron capture cross section
21、for a Maxwellian flux is used.DCross section is primarily due to a single isotope, whose isotopic abundance is variable in nature. The value can vary between 733 and 779 barns depending uponthe source. See Holden, N. E., Neutron Capture Cross Section Standards for BNL-325, Fourth Ed., BNL-NCS-51388,
22、 January 1981.ECross section is primarily due to a single isotope, whose isotopic abundance is variable in nature. The value can vary between 69 and 72 barns depending upon thesource. See Holden, N. E., Neutron Capture Cross Section Standards for BNL-325, Fourth Ed., BNL-NCS-51388, January 1981.C123
23、30324.5 Plutonium, thorium and uranium have not been in-cluded, as they are fissionable elements.5. Keywords5.1 boron; neutron absorption; nuclear materials; nuclearpoisonsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned
24、in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and m
25、ust be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of t
26、heresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C1233033
